US5516110AExpiredUtility

Two piece golf ball

Assignee: SUMITOMO RUBBER INDPriority: Sep 21, 1992Filed: Sep 13, 1993Granted: May 14, 1996

Est. expirySep 21, 2012(expired)· nominal 20-yr term from priority

Inventors:Yoshikazu Yabuki Seiichiro Endo

A63B 37/00622A63B 37/00621Y10S273/22A63B 37/0065A63B 37/0033A63B 37/0074A63B 37/0003

PatentIndex Score

168

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Claims

Abstract

The objective of the present invention is to bring hit feeling of two-piece balls closer to that of thread-wound golf balls. The two-piece golf ball of the present invention comprises a core formed from a rubber composition comprising a base rubber, a co-crosslinking agent and an organic peroxide, and a cover covering the core, wherein said core has the following hardness distribution when measured by a JIS-C hardness meter; (1) hardness at a center: 58-73 (2) hardness at 5-10 mm from the center: 68-78 (3) hardness at 15 mm from the center: 76-88 (4) surface hardness: 78-88 (in the hardness distribution, hardness (2) is substantially constant being within the above range, of which tolerance is within ±3 and the other values satisfy the relation of (1)<(2)<(3)≦(4) ), a compression deformation of the core is 2.8-3.5 mm when pressurized by an initial load of 10 kg up to a final load of 130 kg and said cover has a thickness of 1.5-1.9 mm.

Claims

exact text as granted — not AI-modified

What is claimed is: 
     
       1. A two-piece golf ball comprising a core formed from a rubber composition Comprising a base rubber, a co-crosslinking agent and an organic peroxide, and a cover covering the core, wherein said core has the following hardness distribution when measured by a JIS-C hardness meter; (1) hardness at a center: 58-73   (2) hardness at 5-10 mm from the center: 68-78   (3) hardness at 15 mm from the center: 76-88   (4) surface hardness: 78-88 wherein in the hardness distribution, hardness (2) is substantially constant being within the above range, of which tolerance is within ±3 and the other values satisfy the relation of (1)&lt;(2)&lt;(3)≦(4), a compression deformation of the core is 2.8-3.5 mm when pressurized by an initial load of 10 kg up to a final load of 130 kg and said cover has a thickness of 1.5-1.9 mm.     
     
     
       2. The golf ball according to claim 1 wherein said core is made from a rubber composition which comprises cis-1,4-butadiene rubber, zinc diacrylate and dicumyl peroxide. 
     
     
       3. The golf ball according to claim 2 wherein said rubber composition further comprises filler and antioxidant. 
     
     
       4. The golf ball according to claim 1 wherein said cover is formed from an ionomer resin and filler. 
     
     
       5. The golf ball according to claim 1 wherein said cover has a stiffness of 3,000 to 4,500 Kg/cm 2 .

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